Boot a G4 to OS9

Among my Macs, I have a G4 Dual 867 Mhz machine that I would like to dual boot OSX and OS9.

I understand that these machines could dual boot, however, I have been unsuccessful. Thus far, I cannot get the machine to recognise the OS9 startup disc (Booting by pressing the "C" key on restart) and it boots to OSX by default.

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